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Why does my computer get less battery life with Ubuntu compared to Windows?

When I used Windows 7 with Dell Inspiron, I got a battery life of 2 hours. But ever since I installed Ubuntu, the battery life has taken a hit. When I recharge the battery to almost full and then unplug it from power socket, the battery shows 1:42 hours. But within a minute, this drops down to 0:41.

I even installed powertop 1.97 to combat this, but only configurations I can do in powertop is within tunables, which is shown in the figure.

Powertop tunables

I heard that powertop almost increases battery capacity by double. So, what should I do?

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marked as duplicate by Eliah Kagan, Ringtail, Jorge Castro, gertvdijk, fabricator4 Jan 11 '13 at 8:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

On some Dells the embedded controller (EC) gets confused; removing the power and the battery and leaving the machine for a few minutes for the EC to powerdown may help.

If the machine is consuming too much power it may be worth consulting:

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Have you re-calibrated the battery? This can be done by letting it drain completely, then charging it over night.

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I was also experiencing this similar problem. my dell inspiron would only give 2 hours of backup. Then i found an application called jupiter. after its installation i got approx 3:30 backup power. to install jupiter just enter the following ppa in the terminal.

  1. sudo add-apt-repository ppa:webupd8team/jupiter
  2. sudo apt-get update
  3. sudo apt-get install jupiter
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